2621215213 has 4 divisors (see below), whose sum is σ = 2621683260. Its totient is φ = 2620747168.

The previous prime is 2621215187. The next prime is 2621215229. The reversal of 2621215213 is 3125121262.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1284362244 + 1336852969 = 35838^2 + 36563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2621215213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621215253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225520 + ... + 236857.

It is an arithmetic number, because the mean of its divisors is an integer number (655420815).

Almost surely, 2^2621215213 is an apocalyptic number.

It is an amenable number.

2621215213 is a deficient number, since it is larger than the sum of its proper divisors (468047).

2621215213 is an equidigital number, since it uses as much as digits as its factorization.

2621215213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468046.

The product of its digits is 1440, while the sum is 25.

The square root of 2621215213 is about 51197.8047673921. The cubic root of 2621215213 is about 1378.7987889614.

Adding to 2621215213 its reverse (3125121262), we get a palindrome (5746336475).

The spelling of 2621215213 in words is "two billion, six hundred twenty-one million, two hundred fifteen thousand, two hundred thirteen".